Improvement in door-locks



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' Door Locks. 1N@ 136,049.

Papentedfeb 18,1873I` IMI vnu

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lulllll Illllllllllllill mmsiiflum HENRY n.

PATENT OFFICE..

ELwELnoF YSOUTH NORWALK, ooNNEoTro UT, AssIGNoa To THE NORWALK LOOK COMPANY, or SAME PLAGE.

IMPROVEMENT IN- oooRfLocKs.

Speciiicaton forming pari of Leiters Patent No. 136,049, dated February 18, 173.

To all whom it may concer-n:

' -neciionwith the accompanying drawing and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawing constitutes part of this specification, and representsin'-lv Figure l "a side View( with the coveringplate removed, showing; the operation of the tumblers with the principal key; Fig. 2, the same view ot' thelower portion, illustrating the operation of the tumblers with the pass-key; Fig. 3, the same view with the'principal tumblers removed, illustrating the operation of the pass-key tumblers; Fig. 4, the reverse side ot' the lock-bolt; Fig.5, the pass-key; and in Fig. 6 the principal key.

This invention relates to an improvement in that class of knob-latches and locks which are commonly called hotel-locks-that is to c say, alock in which an arrangement is prol vided for the operation of the bolt by either a principal key or master key, either of which will operate the bolt irrespective of which may have made the previous operation. The invention consists incombining with the lockbolt two sets of tumblers, one set hung to a iixed pivot in the'lock-case, and the other set to the lock-bolt, one set only actuated by the pass-key, and eachset independent of the other in its action. A v

A is the lock-case, of common external construction; B, the latch-bolt, provided with any ot' the known mechanisms for connection with the knobspindle. C is the princi-pal lock-bolt made thinner from its head back into the case, substantially as in other locks, and guided in its movements by a stud, d, extending through a slot in the tail of the bolt. yOn one side of the lock-bolt tumblers D, more or less in nu1nber, are arranged upon a pivot, E. The said pivot Eis stationary in the case, and extends through a slot in the lock-bolt, as-seen in Fig. 3, forming a xed bearing upon which the tumblers turn. Preferably I make the keys which operate thebolt pipe-keys, and to receive the key I fix aspindle, d, in the case,

onto which spindle the key sits in the usual manner for pipe-keys. The tumblers D are preferably made to be operatedby the principal key, Fig. 6, the bit being fitted to actuate the tumblers in the usual mannerthat is, so as to raise the rear and throw down the forward end of the tumblers, as denoted in broken lines, and then throw the bolt. In a 'sexies of these locks. the bit of the principal key is' different for different locks, each key fitting its own lock and no other. Raising the tumbler, as before described, and throwing the bolt,the stud n, which is upon a tumbler attached to or in connection with the lockbolt, passes through the gate or slip in the tumblers, asf denoted in broken lines, Fig. 1. This operation is substantially the same as in many locks. Upon the reverse side of the lock-bolt C, and pivoted thereto at f,I arrange other tumblers, F G. 0n one of these tumblers Gr the stud n is iixed, and through these tumblers a slot, H, is formed, the slot setting over a stud, m, in the case, as seen1 in Fig. 3, and in the slot of the tumbler F a projection, t, is made to drop down in the rear of the stud m, as seen in Fig. 3, which will prevent the throwing of the lock-bolt until this turnbler is raised therefrom; hence, one portion of the bit of the principal key must raise that tumbler7 as denoted in broken lines, Fig. 4, but that key has no effect upon the tumbler G which carries the stud u. Each tumbler is "provided with a spring to hold it in its proper relative position in substantially the usual manner. The pass-key, Fig. 5, enters the same key-hole upon the same stud d, its bit cut so as to escape the tumblers D, andso as to act- `uate only the tumblers F G. Turning the key the bit strikes these tumblers, raises the tumler F the same as the principal key, and also vraises the tumbler G, and with it the stud n,

sary-that both keys should operate this tumbler; and this is desirable for the perfect security of the lock. I have also represented the stud n as fixed to or made apart of one tumbler only; but it will be evident to those skilled .in lock mechanism that a part of this stud may be formed on one tumbler and a part on another. I therefore do not confine myself to the use of the tumbler F or to the use of the stud n upon one tumbler only.

Preferably I construct the lock with the key-hole only on the outside for this bolt. Above the principal bolt I arrange a second bolt, L, as seen in Fig. l, upon which is a tumbler, P, with its independent key-hole R upon kthe opposite side, and this tulnbler and lbolt I construct to be operated by either key, or it may lie by theprincipal key only, so that a differentbolt is thrown upon the inside from that thrown upon the outside, as in common twobolt locks.

In order to prevent the throwing of one bolt while the other is thrown, I form a stud, s, on the principal bolt, and extend an arm, T, of the tumbler P down below the line of the said stud, as seen in Fig. 1; hence, when the bolt L is thrown, ias denoted in broken lines, the arm T of the tumbler will drop down forward of the studs, and thus prevent the throw- A lock-bolt, provided with a principal and auxiliary set of tumblers, each set consisting of one or more, the principal `set pivoted to the lock-case, and the auxiliary set to the lockbolt, the principal set constructed with a slip and the auxiliary set-with a stud, o1.; one key operating the principal tumblers to turn the slip into the path of the stud, the other key to raise the auxiliary set to bring the stud into line with the slip, each set operated in- `dependently of theother, substantially as set forth.

HENRY H. ELVVELL.

Witnesses A. J. TrBBITs, J. H. SHUMWAY. 

